• Only one "master" key can open all locks, but a group of locks "master" keys can open each lock with its own key. In addition, there are several levels of master keys can be designed to open different sets of locks. • The master key system has a total of 7 levels that can be set as needed. And cross levels of master key system can be set too. • There are different kinds of cylinder locks (US cylinder lock, Euro cylinder lock, round cylinder lock, etc.)can be also incorporated into the master key system, to meet customer's special needs.
Each door lock can be opened with a different key. However, the apartment owner's door key can also open all public locks and exit locks.
